145331399 has 4 divisors (see below), whose sum is σ = 152980440. Its totient is φ = 137682360.

The previous prime is 145331369. The next prime is 145331401. The reversal of 145331399 is 993133541.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 145331399 - 2⁸ = 145331143 is a prime.

It is a super-2 number, since 2×145331399² = 42242431070594402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145331369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3824492 + ... + 3824529.

It is an arithmetic number, because the mean of its divisors is an integer number (38245110).

Almost surely, 2^145331399 is an apocalyptic number.

145331399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

145331399 is a deficient number, since it is larger than the sum of its proper divisors (7649041).

145331399 is an equidigital number, since it uses as much as digits as its factorization.

145331399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7649040.

The product of its digits is 43740, while the sum is 38.

The square root of 145331399 is about 12055.3473197581. The cubic root of 145331399 is about 525.7587203678.

The spelling of 145331399 in words is "one hundred forty-five million, three hundred thirty-one thousand, three hundred ninety-nine".